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                <time class="level-item has-text-grey" datetime="2017-03-23T04:47:33.000Z">2017-03-23</time>
                
                
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                How sentinel build Redis master-slave
            
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            <h3 id="Server-Environment"><a href="#Server-Environment" class="headerlink" title="Server Environment"></a>Server Environment</h3><figure class="highlight plain hljs"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">$ cat /etc/issue</span><br><span class="line">Ubuntu 16.04.2 LTS \n \l</span><br><span class="line"></span><br><span class="line">$ redis-server --version</span><br><span class="line">Redis server v=3.0.6 sha=00000000:0 malloc=jemalloc-3.6.0 bits=64</span><br></pre></td></tr></table></figure>

<a id="more"></a>

<h3 id="Target-Redis-cluster"><a href="#Target-Redis-cluster" class="headerlink" title="Target Redis cluster"></a>Target Redis cluster</h3><figure class="highlight plain hljs"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">redis-master //Port: 6300</span><br><span class="line">redis-slave1 //Port: 6301</span><br><span class="line">redis-slave2 //Port: 6302</span><br><span class="line">redis-sentinel //Port: 16300</span><br></pre></td></tr></table></figure>

<h3 id="Install-redis-server"><a href="#Install-redis-server" class="headerlink" title="Install redis-server"></a>Install redis-server</h3><figure class="highlight plain hljs"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$ sudo apt-get install -y redis-server</span><br></pre></td></tr></table></figure>

<h3 id="Install-redis-sentinel"><a href="#Install-redis-sentinel" class="headerlink" title="Install redis-sentinel"></a>Install redis-sentinel</h3><figure class="highlight plain hljs"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$ sudo apt-get install -y redis-sentinel</span><br></pre></td></tr></table></figure>

<h3 id="Make-the-directory-and-config-file"><a href="#Make-the-directory-and-config-file" class="headerlink" title="Make the directory and config file"></a>Make the directory and config file</h3><figure class="highlight plain hljs"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line">$ cd /app/</span><br><span class="line">$ mkdir -p redis-cluster/node1 redis-cluster/node2 redis-cluster/node3 redis-sentinel/node1</span><br><span class="line">$ touch redis-cluster/node1/redis.conf </span><br><span class="line">$ touch redis-cluster/node2/redis.conf </span><br><span class="line">$ touch redis-cluster/node3/redis.conf</span><br><span class="line">$ touch redis-sentinel/node1/sentinel.conf</span><br></pre></td></tr></table></figure>

<p>Directory looks like this:</p>
<figure class="highlight plain hljs"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line">$ tree app</span><br><span class="line">app</span><br><span class="line">|-- redis-cluster</span><br><span class="line">|   |-- node1</span><br><span class="line">|   |   `-- redis.conf</span><br><span class="line">|   |-- node2</span><br><span class="line">|   |   `-- redis.conf</span><br><span class="line">|   `-- node3</span><br><span class="line">|       `-- redis.conf</span><br><span class="line">`-- redis-sentinel</span><br><span class="line">    `-- node1</span><br><span class="line">        `-- sentinel.conf</span><br></pre></td></tr></table></figure>

<p>And the redis cluster config file content:</p>
<figure class="highlight plain hljs"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line">$ cat redis-cluster/node1/redis.conf</span><br><span class="line">bind 127.0.0.1</span><br><span class="line">port 6300</span><br><span class="line">daemonize yes</span><br><span class="line">slave-read-only yes</span><br><span class="line">dir /app/redis-cluster/node1</span><br><span class="line">pidfile /app/redis-cluster/node1/node.pid</span><br><span class="line">logfile /app/redis-cluster/node1/node.log</span><br><span class="line">dbfilename node.rdb</span><br></pre></td></tr></table></figure>

<figure class="highlight plain hljs"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line">$ cat redis-cluster/node2/redis.conf</span><br><span class="line">bind 127.0.0.1</span><br><span class="line">port 6301</span><br><span class="line">slaveof 127.0.0.1 6300</span><br><span class="line">daemonize yes</span><br><span class="line">slave-read-only yes</span><br><span class="line">dir /app/redis-cluster/node2</span><br><span class="line">pidfile /app/redis-cluster/node2/node.pid</span><br><span class="line">logfile /app/redis-cluster/node2/node.log</span><br><span class="line">dbfilename node.rdb</span><br></pre></td></tr></table></figure>

<figure class="highlight plain hljs"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line">$ cat redis-cluster/node3/redis.conf</span><br><span class="line">bind 127.0.0.1</span><br><span class="line">port 6302</span><br><span class="line">slaveof 127.0.0.1 6300</span><br><span class="line">daemonize yes</span><br><span class="line">slave-read-only yes</span><br><span class="line">dir /app/redis-cluster/node3</span><br><span class="line">pidfile /app/redis-cluster/node3/node.pid</span><br><span class="line">logfile /app/redis-cluster/node3/node.log</span><br><span class="line">dbfilename node.rdb</span><br></pre></td></tr></table></figure>

<p>Redis sentinel config file content:</p>
<figure class="highlight plain hljs"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line">$ cat redis-sentinel/node1/sentinel.conf</span><br><span class="line">bind 127.0.0.1</span><br><span class="line">port 16300</span><br><span class="line">daemonize yes</span><br><span class="line">dir /app/redis-sentinel/node1</span><br><span class="line">pidfile /app/redis-sentinel/node1/s.pid</span><br><span class="line">logfile /app/redis-sentinel/node1/s.log</span><br><span class="line"></span><br><span class="line">sentinel monitor redis-cluster 127.0.0.1 6300 1</span><br><span class="line">sentinel down-after-milliseconds redis-cluster 5000</span><br><span class="line">sentinel failover-timeout redis-cluster 10000</span><br></pre></td></tr></table></figure>

<ul>
<li><p>Look at line 9:<br>“redis-cluster” is redis cluster name which master node ‘s ip is 127.0.0.1 and port is 6300. The last param “1” means that one sentinel can elect the master redis node.</p>
</li>
<li><p>Line 10 means that if no response in 5 seconds, the election will start</p>
</li>
</ul>
<h3 id="Start-Redis-server-and-Sentinel"><a href="#Start-Redis-server-and-Sentinel" class="headerlink" title="Start Redis server and Sentinel"></a>Start Redis server and Sentinel</h3><figure class="highlight plain hljs"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">$ redis-server redis-cluster/node1/redis.conf </span><br><span class="line">$ redis-server redis-cluster/node2/redis.conf </span><br><span class="line">$ redis-server redis-cluster/node3/redis.conf</span><br><span class="line">$ redis-sentinel redis-sentinel/node1/sentinel.conf</span><br></pre></td></tr></table></figure>

<figure class="highlight plain hljs"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">$ ps aux | grep redis</span><br><span class="line">root       109  0.0  0.1  37220  3528 ?        Ssl  06:43   0:00 redis-server 127.0.0.1:6300</span><br><span class="line">root       113  0.0  0.1  37220  3500 ?        Ssl  06:43   0:00 redis-server 127.0.0.1:6301</span><br><span class="line">root       118  0.0  0.1  37220  3428 ?        Ssl  06:43   0:00 redis-server 127.0.0.1:6302</span><br><span class="line">root       125  0.2  0.1  37220  3420 ?        Ssl  06:44   0:00 redis-sentinel 127.0.0.1:16300 [sentinel]</span><br></pre></td></tr></table></figure>

<h3 id="Check-the-Redis-cluster-info"><a href="#Check-the-Redis-cluster-info" class="headerlink" title="Check the Redis cluster info"></a>Check the Redis cluster info</h3><figure class="highlight plain hljs"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line">$ redis-cli -p 6300 info | grep -A 5 Replication</span><br><span class="line"># Replication</span><br><span class="line">role:master</span><br><span class="line">connected_slaves:2</span><br><span class="line">slave0:ip=127.0.0.1,port=6301,state=online,offset=32382,lag=1</span><br><span class="line">slave1:ip=127.0.0.1,port=6302,state=online,offset=32382,lag=1</span><br><span class="line">master_repl_offset:32382</span><br></pre></td></tr></table></figure>

<p>Cluster has been build success.</p>
<h3 id="Is-Node-automatically-selected-as-the-master-node"><a href="#Is-Node-automatically-selected-as-the-master-node" class="headerlink" title="Is Node automatically selected as the master node"></a>Is Node automatically selected as the master node</h3><p>Halt the master node1 </p>
<figure class="highlight plain hljs"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$ redis-cli -p 6300 debug segfault</span><br></pre></td></tr></table></figure>

<p>Check the process</p>
<figure class="highlight plain hljs"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">$ ps aux | grep redis</span><br><span class="line">root       113  0.0  0.1  37220  3500 ?        Ssl  06:43   0:00 redis-server 127.0.0.1:6301</span><br><span class="line">root       118  0.0  0.1  37220  3428 ?        Ssl  06:43   0:00 redis-server 127.0.0.1:6302</span><br><span class="line">root       125  0.2  0.1  37220  3420 ?        Ssl  06:44   0:01 redis-sentinel 127.0.0.1:16300 [sentinel]</span><br></pre></td></tr></table></figure>

<p>Then Check the redis cluster status</p>
<figure class="highlight plain hljs"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line">$ redis-cli -p 6301 info | grep -A 5 Replication</span><br><span class="line"># Replication</span><br><span class="line">role:slave</span><br><span class="line">master_host:127.0.0.1</span><br><span class="line">master_port:6302</span><br><span class="line">master_link_status:up</span><br><span class="line">master_last_io_seconds_ago:1</span><br><span class="line"></span><br><span class="line">$ redis-cli -p 6302 info | grep -A 5 Replication</span><br><span class="line"># Replication</span><br><span class="line">role:master</span><br><span class="line">connected_slaves:1</span><br><span class="line">slave0:ip=127.0.0.1,port=6301,state=online,offset=2840,lag=1</span><br><span class="line">master_repl_offset:2840</span><br><span class="line">repl_backlog_active:1</span><br></pre></td></tr></table></figure>

<ul>
<li>Slave’s election will mainly evaluate slave in the following reason:<ol>
<li>Slave priority</li>
<li>Process ID</li>
</ol>
</li>
</ul>
<h3 id="Get-the-master-node-by-sentinel"><a href="#Get-the-master-node-by-sentinel" class="headerlink" title="Get the master node by sentinel"></a>Get the master node by sentinel</h3><figure class="highlight plain hljs"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">$ redis-cli -p 16300 sentinel get-master-addr-by-name redis-cluster</span><br><span class="line">1) &quot;127.0.0.1&quot;</span><br><span class="line">2) &quot;6302&quot;</span><br></pre></td></tr></table></figure>

<p>Ok, we can see the node with port 6302 has been elected as the master node.</p>

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                    <span class="level-item tag">3</span>
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                    <span class="level-item tag">6</span>
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                    <span class="level-item tag">5</span>
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                    <span class="level-item tag">8</span>
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                    <span class="level-item tag">10</span>
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                    <span class="level-item tag">9</span>
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